Screw-machine.



Patented Mine 27; I899. G. E. RANDLES.

SCREW MACHINE.

Patented June 27, I899.

G. E. RAN DLES.

SCREW MACHINE.

[Application filed Oct. 7, 1898.)

2 Sheets-Sheet 2.

(No Model.)

I l l J 4 u I. |l|| u l u Q H u n In vendor:

G'- E 13a)? Z193,

By 50 0 jhorney THE Ncnms Psrzps co., momuwa, WASHINGTON, D c.

UNITED STATES PATENT OFFICE.

RANDLES, OF HARTFORD, CONNECTICUT, ASSIGNOR -TO THE PRATT d: \VHITNEYCOMPANY, OF SAME PLACE.

SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent No. 627,529, dated June 27,1899. Application filed October '7, 1898. Serial No. 692,927. (Nomodel.)

To all whom it may concern: 7

Be it known that I, GEORGE E. HANDLES, a citizen of the United States,residing in Hartford, in the county of Hartford and State ofConnecticut, have'invented certain new and useful Improvements inScrew-Machines, of which the following is a specification.

This invention relates to screw-machines, and more especially to meansfor automatically regulating the length of a thread to be cutindependently of the mechanism which drives or feeds the turret or othercarrier for the threading-tool and to a device for holding saidthreading-tool.

My invention includes as one of its features work-holding means, ascrew-threading'or analogous tool, a carrier for said tool, means forfeeding the carrier, a holder for said screw-threading tool, and meansoperable independently of the carrier-feeding means for regulating ordetermining the length of thread to be out. The means for controllingthe length of thread. is preferably adjustable and is usually carried bythe holder for the screw-threading or other tool, by reason of which theamount of thread to be out can be readily and quickly varied withoutadjusting any parts of the feed or driving mechanism for said carrier,this last-mentioned operation ordinarily consuming considerable time andnecessitating great care in this class of apparatus as now constructed.

My invention includes as another of its features a holder for a tool,suchas a screwthreading die or tap, consisting of two sections, one ofwhich is usually reciprocative and oppositely rotative relatively to theother, and a stop located to arrest the motion of said reciprocative andoppositely-rotative section at a predetermined point.

-In screw-machines the work is usually fixed against longitudinalmovement during the formation of a thread, and the holder which carriesthe die or tap is advanced either. to form an external or internalthread, and the tool in my improved machine is held by the holder justspecified, the two parts of which, for convenience in distinguishingthem, being denoted, respectively, by the terms fixed and movablemembers. The movable member of the holder, which directly carries thethreading-tool, usually has a perforation or recess adapted to receive aprojection or pin carried by the fixed member, which slides in saidrecess, and in practice I prefer to em-,

ploy a series of such recesses and a corresponding series of projectionsor pins. A

In the drawings accompanying and forming part of this specification,Figure l is a side elevation of a screw-machine of known constructionprovided with my improvements. elevations of the holder for the screw orother tool, on an enlarged scale, and showthe movable member thereof inthree of its positions during the formation of a thread, and saidfigures illustrate a turret by dotted lines. Fig. 5 is a cross-sectionalview taken in line 5 5, Fig. 3, looking in the direction of the arrow a;and Fig. 6 is a similar view looking in thedirection of the arrow 1).

Similar characters designate like parts in all the figures of thedrawings.

The framework for sustaining the several parts of the machine isillustrated as consisting of a main frame A and an auxiliary frame B,the latter directly supporting the drivingshafts, feed mechanism, 850.

In a general way the construction and operation of the machineillustrated are in many respects similar to those of automaticscrewmachines now-in use, and said machine embodies the usual cam-shaft2, carrying a series of cam-drivers for operating the difierent toolsand other parts of the machine, a work-spindle, as 3, a turret-slide, as4, carrying a turret 5, which is equipped with the usual tools foroperating upon the blank, and a chuck 5 for holding the work a: to beoperated upon.

The mechanism for reciprocating the turret-slide 4t, and consequentlythe turret 5, and for also rotating said turret to bring the suc-Figs..2, 3, and 4 are sectional side.

cessive tools thereof into position for opera- 7 of which and thebelt-shipping mechanismare not shown.

My invention includes as one of its features a holder for a tool, saidholder being clamped in the turret 5 and being designated by II andadapted to hold a tool, as T, which is represented in the present caseas a die for cutting an external thread, although it is obvious that atap or other metal-workiu g tool could be secured in the holder.

The holder H usually embodies two disks l and 12, the two parts beingdenoted, respectively, for convenience as the fixed and the movablemembers of the device and the part 10 having a shank or stem 13, whichfits into a socket 14 in the turret and is held therein in the usualmanner, and the part 12 having an elongated shank 12', which slides inthe bore 12, formed centrallyin the part and extending through the stem13 of said part 10. The sect-ion 12 of the toolholder is mounted forreciprocative and oppositely-rotative movement relatively to itscompanion, and one of said members is provided with means for regulatingautomatically the amount of forward movement of the movable member, andthereby determining the length of thread to be cut.

The means illustrated for controlling the forward stroke of the movableholder-section 12 is illustrated consisting of a series of projectionsor pins,which may be of any number, (four beingillustrated herein anddesignated, respectively, by 15,16, 17, and 18.) Said pins are shown ascarried by the fixed member 10 of the holder, although this dispositionmay be reversed without departing from the spirit of the invention, andsaid pins are adapted to enter a corresponding series of perforations orrecesses, as 15, 16, 17, and 18,which are formed in the member 12, asrepresented in Fig. 2.

In Fig. 2 the die or tool T is represented as operating upon the work00,which is rotating in the direction of the arrow, and the outer endsof the several pins are shown as disposed in the cooperating recesses inthe member 10, by reason of which the work or blank as it rotates willtend to rotate the said member 12; but the pins being rigid on themember 10,which it will be understood is fixed against rotativemovement, the rotation of the member 12 is thereby prevented, and itnaturally follows that the advance of said member 12 is caused by thethread being cut on the blank. The forward movement continues until thepins are clear of their recesses, as represented in Fig. 3, by reason ofwhichthe part 12 is free to rotate and the further advance of said part12 cannot occur.

It will be understood from the foregoing description that the pins 15,16, 17, and 18 control the operation of the tool, and for the purpose ofcutting threads of different lengths without the necessity ofmanipulating the driving mechanism F, I prefer to make the pinsadjustable, they being adapted to move longitudinally through a seriesof holes extending through the part 10, as indicated in Fig. 2. Each ofthe pins has a thread, as 19,

adapted to be engaged by the corresponding thread of theinternally-threaded collars 20 and 21, rotatively supported upon thefixed member 10. Said collars serve to move all of the pinssimultaneously, one of them being adapted to move said pins forward andthe other backward,while that collar which is not employed for feedingthe pins is carried with them as they move and is then turned backwardto serve as a check-nut firmly to hold said pins in their adjustedpositions.

The threaded pins 15, 16, 17, and 18 are held against turning by aseries of keys, as 2i.

After the pins have passed out of the recesses the reversing mechanismstarts and reversely rotates the chuck-spindle and the member 12, and inconnection with the pins I prefer to provide a series of stops, as and26. While one of these stops will serve the purpose, I prefer to employtwo, as I therebysecure a more stable structure. The stops 25 and 26 areyieldingly mounted and are disposed in suitably-formed diametricallyopposite sockets in the member 12, and they project normally beyond theinner face of said member. On the advance or forward rotation of themember 12 the stops will strike the fixed pins when the latter arewithdrawn from the recesses and will be forced into their seats by saidpins, whereby said member may freely rotate; but on the reversal of theretation of said member the heads of the stops will strike two of thepins, and thereby arrest further rotative movement of the member 12.This being the case, said member 12 will be forced toward the member 10by the threaded work as it withdraws from the die, and the pins 15, 16,17, and 18 will enter the recesses 15, &c., as indicated in Fig. 4,until the parts 10 and 12 come into contact.

The stops 25 and 26 are preferably springactuated, and each of themconsists of a pin longitudinally slidable in socket in the part 12, saidpins having enlarged heads, as 25 and 26, extending normally beyond theinner face of the part 12 and each of them being beveled, as at 30. Thetwo stops are held in their outer positions by coiled springs, as 31 and32, disposed in the hollow shanks 33 and 34 of said stops and bearingagainst the part 12 and the stops, respectively, and are held againstrotation and also in their seats by the screws 35 and 36, carried by thepart 12, the inner ends of which are disposed in longitudinal slots, as35 and 36, in the hollow shanks of the two stops. Vhen the pins 15, 16,17, and 18 are clear of the recesses 15, 16, 17, and 18' in the part 12,as represented in Fig. 3, the beveled ends 30 of the stops will impingeagainst the ends of said pins as the part 12 rotates, thereby forcingthe stops into their seats and permitting such rotation until thereversing mechanism operates, when the projecting portions of the twostops will strike said pins, which instantly prevents further rotationof the part 12, and consequently causes the rearward feed of said partas the work rotates in the direction of the arrow in Fig. 4. v

The tool T is usually held in the part 12 by the set-screw 40, althoughother means can be utilized for this purpose.

Meansare employed for holding the two sections of the holder H normallyin contact, and said means is represented as consisting of the coiledspring 45, bearing against the shoulder 46 on the part and also-againstthe collar 47 on the end of the stem 12, said collar being fixed inplace by the pin 48.

WVhen the part-12 has advanced in the manner hereinbefore specified, thespring is compressed and relaxes on the opposite movement of said part10; but its only purpose is to hold the two parts in contact except whena thread is being cut. I

The invention is not limited to the particular features of constructionhereinbefore described, as many changes maybe adopted by personsconversantwith this class of apparatus without departing from the scopethereof.

Having described my invention, I claim-- 1. A tool-holder consisting oftwo members, one of which is reciprocative and rotative relatively tothe other,one of said members having a pin and the other a stopindependently mounted for yielding movement and adapted to be engaged bysaid pin.

2. A tool-holder consisting of two members, one of which isreciprocative and rotative relatively to the other, one of said membershaving a pin and the other a yielding stop beveled at its working endand adapted to be engaged by said pin.

3. A tool-holderconsistin g of two members, one of which isreciprocative and rotativerelatively to the other, one of said membershaving an adjustable pin and the other a stop i11- dependently mountedfor yielding movement and adapted to be engaged by said pin.

4. Atool-holder consisting of two members, one of which is reciprocativeand rotative relatively to the other, one of said members having athreaded pin and also having a nut adapted to engage the thread on saidpin whereby to adjust the same, and the other member having a stopadapted to be engaged by said pin.

5. The combination,with a tool-holder comprising two members, one ofwhich is reciprocative and rotative relatively to the other, of athreaded pin carried by one of said members and adapted to fit inarecess or perforation of the other member; a nut for adjusting saidpin; and a stop on the other member adapted to be engaged by said pin.

6. The combinatiomwith a tool-holder comprisingtwo members, one of whichis recip-' rocative and rotative relatively to the other and is providedwith a series of recesses or perforations, of a series of pins carriedby one of on one of the members adapted to be engaged by said pins.

7. The combination,with atool-holdercom- .prising two members, one ofwhich is reciprocative and rotative relatively to the other,

of a pin carried by one of said members and adapted to fit in a recessor perforation of the other member; means for adjusting said pin; and astop on the other member adapted to be engaged by said pin.

8. The combination,with a tool-holder comprising two members, one ofwhich is recip rocative and rotative relatively to' the other, ofathreaded pin carried by one of said members; nuts for engaging thethread of said pin; and a stop carried by the other member and adaptedto be engaged by the pin.

' The combination,with a tool-holderoomprising two members, one of whichis reciprocative and rotative relatively to the other, said memberhaving a recess or perforation,

.of a yielding stop adjacent to said recess or perforation; and a pincarried by the other member and adapted to enter the recess orperforation and also to engage said stop, substantially asand for thepurpose specified.

10. The combination,with a tool-holder comprising two members one ofwhich is reciprocative and rotative. relatively to the other and isrecessed 0r perforated, of a projection carried by one of said members;'a yielding stop moun ted on the other member and adapted to be engagedby said projection; and a spring for normally holding the two members incontact.

11. The combination,with ato'ol-holder comprising two members, one ofsaid members havingasocket, of a stem carried by the other member andfitting in said socket; a projection carried by one member and adaptedto fit in arecess of the other member; a yieldingstop adapted to beengaged by the projection; and a spring bearing against a collar on thestem and serving normally to hold the two members in contact.

12. A tool-holder comprising two members, one of which is reciprocativeand rotative rel atively to the other, one of said members having a pinand the other a yielding stop adapted to be engaged by said pin; andmeans carried by the member which supports said stop for holding thelatter against rotation.

13. The conibinatiomwith a tool-holder comprising two members, one ofwhich is reciprocative and rotative relatively to the other, one of saidmembers having a socket, of a yielding stop having a slotted shankfitted in said socket; a pin on the other member adapted to engage saidstop; and a device entering the slot of said shank for preventing thestop from turning.

14. The combination, with a reciprocative slide and with means foractuating said slide, of a tool-holder mounted on the slide; meanscomprising two members, one of which is reciprocative and rotativerelatively to the other and is adapted to carry a screw-cutting tool,one of said members being provided with a series of recesses 0rperforations; a series of pins carried by one member and adapted to fitin recesses or perforations of the other member; means for adjustingsaid pins; a series of stops on one of the members adapted to be engagedby said pins; a chuck-spindle; and means including reversing mechanismfor operating said spindle, substantially as and for the purposespecified.

15. The combination, with the turret-slide of a lathe, of a turretcarried by the slide; a chuck spindle; means including reversingWitnesses:

HEATH SUTHERLAND, HENRY BISSELL.

